Android: REG: Fix launching intents

When the launch mode is singleInstance, then intents will not be
launched as activities inside the same task, but as separate
tasks, and onActivityResult() is always called immediately
without any data. This is documented in various stack overflows
and google group messages if you search for it on the Internet,
and the singleInstance launch mode is documented as "not recommended
for normal use". This broke e.g. automatic downloads of Ministro. The
singleTop launch mode seems more like what we're after, and fixes
both the original issue as well as the current problem with intents.

Change-Id: Iab24a654a4433f979064509b1ef721db9ef352af
Reviewed-by: BogDan Vatra <bogdan@kde.org>

src/android/java/AndroidManifest.xml

@@ -5,7 +5,7 @@
                   android:name="org.qtproject.qt5.android.bindings.QtActivity"
                   android:label="@string/app_name"
                   android:screenOrientation="unspecified"
-                  android:launchMode="singleInstance">
+                  android:launchMode="singleTop">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>